“When the president says that he will not make the mistakes of the past, that means the U.S. will not be making substantial concessions, such as lifting sanctions, until North Korea has substantially dismantled its nuclear programs,” a senior Trump administration official told the Journal.

“If North Korea is willing to move quickly to denuclearize, then the sky is the limit,” the official added. “All sorts of good things can happen.”

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Kim announced on Saturday local time that North Korea will shut down its nuclear test site and suspend long-range missile tests, a move Trump touted as “big progress.”

North Korea has agreed to suspend all Nuclear Tests and close up a major test site. This is very good news for North Korea and the World - big progress! Look forward to our Summit.